Apparatus for measuring the peak expiratory rate

A - Human Necessities – 61 – B

Patent

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A61B 5/087 (2006.01)

Patent

CA 2177738

A device for measuring exhaled flow comprises a measuring tube partially obstructed by a narrow part of the tube; and a differential pressure sensor coupled to the tube for measuring the pressures inside the tube on either side of the narrow part. The measuring tube is removable and comprises, at its outer surface, flexible annular seals protruding from the outer surface and located on either side of openings which are in turn located on either side of the narrow part. The measuring tube is insertable in a recess of the device, the recess having a diameter slightly greater than the external diameter of the measuring tube such that, in an abutment position of the measuring tube in the recess, the annular seals define with the recess and the external wall of the tube annular chambers communicating respectively with two passages of the recess, connected to the pressure sensor.

La présente invention concerne un appareil de mesure de débit expiratoire comprenant un tube de mesure (13) partiellement obturé par un rétrécissement (17) de l'intérieur du tube, et un capteur de pression différentiel (27) couplé au tube pour mesurer les pressions dans le tube de part et d'autre du rétrécissement. Le tube de mesure (13) est amovible et comporte sur sa surface externe des joints annulaires souples (21) dépassant de la surface externe et disposés de part et d'autre de lumières (18, 19) débouchant de part et d'autre du rétrécissement. Le tube de mesure est destiné à pénétrer dans un logement (11) de l'appareil, de diamètre légèrement supérieur au diamètre extérieur du tube de mesure de manière que, dans une position en butée (15) du tube de mesure dans le logement, les joints définissent avec le logement (11) et la paroi externe du tube (13) des chambres annulaires (23, 24) communiquant respectivement avec deux passages (25, 26) du logement, reliés au capteur de pression.

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